Method for impregnation of unpaved streets



Patented May 29, 1928.

I UNITED STATES PATENT oFFlcE-" RICHARD LICHTENSTERN, VIENNA, AUSTRIA.

mn'rnonro'n IMPREGNATION OF- UNPAVED STREETS.

No Drawing; Application filed July 21, 1925, Serial No. '45,121,and in Austria August 7,1924.

Already various remedies have beenproposed for preventing or indeed for d1m1mshing the formation of dust on roads without as yet one of these dust-binding remedies having had a. full result. The lacli of efficiency of the dust-binding remedies 1 s to be explained thereby that the oil--for the most part any kind at'all of oily residual product of the distillation of petroleumpanthracite or lignite is employedeafter a little. time soaks underthe road covering, whereby the road surface dries and the old condition of the road is again produced.

There is therefore the question as to providing a permanent insoluble and impenetrable layer that prevents the soaking in of the oil, if the formation of dust is to be stopped efficiently and not merely in a transitory Way.

According to the invention this is effected by utilizing the lime always richly present in the material of which the road is made, for producing insoluble lime soap. By this mode of procedure in a simple Way the road is successfully provided with an impervious covering layer. If now any oily dust-binding medium is applied it remains permanently efiicient, and the question of the dusting oif is therewith to be considered as solved.

The production of the lime soap can re-. sult from the decomposition of sodium or potassium soaps with the calcium present in the road dust as oxide or carbonate. The naphthene soaps that form refuse in the refining of petroleum have shown themselves especially suitable "for this purpose. The application of the dust-binding medium is effected in that a mixture of sodium or potassium soap with any oil usual for this purpose is incorporated in the road surface for example by rolling, whereby the desired formation of calcium soap is effected in the earth itself. It is very suitable to add to the said mixture material that at higher temperature is soft or fluid, for example heavy residual oil containing paraflin. Therewith during the hot day time a road surface is formed wet with oil, whereby the binding of newly formed dust is secured.

The proportion in the mixture of -the several constituents depends naturally on the condition of the road. For a normal road, for example, that has been in existence already for a long time and is made of hard broken stone with finer sand, a product of the following composition isnecessary About 1 to 1 parts of naphthene soap are dissolved in 30 to l0 parts Ofresidue con The road is then directly usable again, the dust has disappeared.

The more lime the road material'contains, the more soap maybe employed. The more soap employed, the less must be employed the residue, containing paraffin, be-

cause the impervious layer, merely treated with distillate, does not need more moisture,

but operates exactly as an idealroad covering, like an asphalt covering. i

It is of course possible, indeed, to employ a productt'hat consists from 20 to tOi and more parts of naphthene soap or other soap solution or of soap and of up to 100 parts of lighter or heavier distillates (mixed oils).

The choice of appropriate material in individual cases must be left to the operators.

In the new construction of roads the mate rial is applied appropriately either with or without the addition of water, at the rolling in of the broken stone-sand layer and then after the rolling of the uppermost layer also this once more is impregnated withv the prod u ct.of the likeor suitably altered constitutlon.v

What I claim is 1. Process for impregnating unpaved roads which comprises forming in the road a layer insoluble in water and impervious to oil and applying above it an oily dustbinding medium. 1

2. In a process for impregnating unpaved reaction of a soap of naphthene acidconp 'taining an alkali metal with a compound of calcium containing oxygen in the material of which the road is formed. 7

4. In a process for impregnating unpaved roads as claimed in claim 3 the reaction of a soap-o1 naphthene acid containing sodium with a compound of calcium containing oxygen in the material of which the road is formed.

5. In a process for impregnating unpaved roads as claimed 111 claim 3 the reactionof a soap of naphthene acid containing potassium with a compoundof calcium Containing oxygen in the material of which the road is formed;

6. In a rocess :torimpregnating unpaved roads as c aimed in claim 3 the reaction of a soap ott' naphthene acid contaii'iing sodium with the calcium carbonate in the material ofwhich the road is formed.

' 7 In a process for impregnating unpaved roads as claimed in claim 3 the reaction of a soap of naphthene acid containing potas-v sium, with the calcium carbonate in the maof naphthene soap in between 30 and parts of petroleum distillation residue containing paraflin with application of heat and between to parts of a normal oil distillate, and diffusing the prepared material on a road. 7

11., An earth road containing a layer of a water insoluble soap and an oily material.

12. An anpavedi-oad having a: layer containing a soap impervious to oil and a layer superposed thereupon containing an oily material. v

lid/An? unpaved road having a surface contalnin'g an oily material and a calcium soap; j

14. An earth road having a layer containing a soap capable olresisting' the penetration" of oily material within the earth through said layer.

15. An earth road having a layer c'ontaining water insoluble soap capable of resisting the penetration of oilyn'iaterial within the earth through said, layer.

16. An earth 'rjoadhaving a layer containing acalciumsoap resistant to the penetra- 17. An earth road havinga layer containing a. calcium compound of naphtliene soap. in testimony whereot I afiix my signature.

RICHARD Lio E s'rEn 

